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Unlike other arachnids, which have their nerve cells evenly distributed along their bodies, the scorpion's nerve cells are clustered in its head, like a mammal's.

A) keep as isB) bodies, the scorpion's head has a cluster of nerve cells, as a mammal doesC) body, the scorpion has a cluster of nerve cells in its head, as a mammal doesD) body, nerve cells are clustered in the scorpion's head, like a mammal'sE) body, a cluster of nerve cells is in the scorpion's head, like a mammal's

A) keep as isincorrect comparison between other arachnids and scorpion's nerve cellsB) bodies, the scorpion's head has a cluster of nerve cells, as a mammal doesincorrect comparison between other arachnids and scorpion's headC) body, the scorpion has a cluster of nerve cells in its head, as a mammal doescorrect comparison between other arachnids and scorpionD) body, nerve cells are clustered in the scorpion's head, like a mammal'sincorrect comparison between other arachnids and nerve cellsE) body, a cluster of nerve cells is in the scorpion's head, like a mammal'sincorrect comparison between other arachnids and a cluster of nerve cells

Unlike other arachnids, which have their nerve cells evenly distributed along their bodies, the scorpion's nerve cells are clustered in its head, like a mammal's.

A) keep as isB) bodies, the scorpion's head has a cluster of nerve cells, as a mammal doesC) body, the scorpion has a cluster of nerve cells in its head, as a mammal doesD) body, nerve cells are clustered in the scorpion's head, like a mammal'sE) body, a cluster of nerve cells is in the scorpion's head, like a mammal's

Please explain in detail. thanks!

I also get C.

Arachnids is overall one group should be body instead of bodies. That rules out A and B. To me the ending in D and E seem very akward.

it must be c. we should look at what is being compared; here we want to compared arachnids, so we must compare arachnids and scorpions. Only C offers this as the other choices compare arachnids and scorpion cells, etc.

The question starts with an implied/underlying sentence of: "Other arachnids have their nerve cells evenly distributed along their bodies." So to make things comparable we need a similar sentence structure: "The scorpion has a cluster of nerve cells in its head." Note that the other choices have either "nerve cells" or "head" as the object, which cannot be compared to "other arachnids". So (C) it is.